https://www.freepatentsonline.com/2122599.pdf
Has anyone used benzoin as a fogging redeveloper?
It seems more stable and much less harmful to human than all the other compounds used as such.
BenzoinWhere can you get dioxindol and benzoin sulfonic acid, the two chemicals used in this patent from 1938?
why not?But none of the formulas in the patent make use of benzoin! Is benzoin the same as benzoin sulfonic acid?
why not?
What's the difference?
Benzoin is soluble in alcoholIf the benzoin you're talking about is the same as this, then it's molecular formula is C6H5COCH(OH)C6H5. Note that it doesn't have any sulfur in it. All sulfonic acids have sulfur in them thanks to the S(=O)2(OH) group. Hence, benzoin and benzoin sulfonic acid can't be the same chemicals, right?
Plain benzoin is hardly soluble in water: less than 0.3g/l @25C. Typically, the presence of sulfonic acid groups increases solubility (as per Haist volume 1). As substantially more benzoin sulfonic acid (2g/l) is used in the formulas in the patent, you might not be able to substitute it with plain benzoin and get the same level of activity.
Unfortunately, benzoin is sparingly soluble even in organic solvents such as acetone and alcohol. So, that route to get more solubility is also ruled out.
Benzoin is soluble in alcohol
http://chemister.ru/Database/properties-en.php?dbid=1&id=1551
Benzoine Sulfonate may be more stable than Sodium Dithionite
99% of "home shooters, who develop at home" would use a kit, and this kit can not use dithionite, if it lasts less than a year in solution.For low volume shooters who develop at home, dithionite solution can always be prepared at the time of processing and it remains stable for at least an hour. Note that processing in dithionite takes less than five minutes. To find a substitute for dithionite on grounds of its instability is solving a wrong problem.
99% of "home shooters, who develop at home" would use a kit, and this kit can not use dithionite, if it lasts less than a year in solution.
In this case I strongly recommend dithionite, since this is the most trivially available and cheap fogging agent out there. The patent authors specifically recommend their novel compounds because of their better stability. If you want stability today, use Stannous Chloride in ATMP.Kits can use whatever they want. Is OP trying to solve kit maker's problem? I thought he was trying to find a fogging redeveloper for his own use.
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